1. Invertebrates & Joint-Legged Animals
SBI 3U
October 18th, 2012
Ms.Zafar

2. Invertebrates Animal grouping No backbone Heterotrophic
Why don’t they have cell walls?

3. We will be studying…
Phylum Mollusca
Phylum Echinodermata

4. Phylum Mollusca
Shell
Marine or terrestrial
Annelid-like ancestors

5. Body Plan
Foot
Mantle
Visceral Mass

6. 3 Classes
Bivalva
Cephalopoda
Gastropoda

7. Class Bivalva Shell-fish Two-part shell
Why do they not need an anterior end?
Gills

8. Class Gastropoda Diverse Big foot Radula Gills
Which mollusks have a lung?

9. Class Cephalopoda Shell  movement Brain development
What has happened to the cephalopod’s shell?

10. Phylum Echinodermata Marine Symmetry shift
Why might Echinoderms have radial symmetry as adults?
Endoskeleton

11. Joint-Legged Animals

12. Joint-Legged Animals
Arthropods

13. Phylum Arthropoda Segmented body Exoskeleton Hemocoel Coelom
Gas exchange – gills & trachea

14. Moulting in Arthropods
Exoskeleton limits size

15. Open Circulatory System
Hemocoel
Ancient annelids developed blood instead of body fluid